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NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access
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Overview of PRBS

Overview of PRBS

PRBS generates random data for service connectivity testing.

During site deployment or device maintenance, PRBS testing can be performed when there is no BER tester. The testing details are as follows:
  • A PRBS testing-enabled local device sends a PRBS bit stream over a link to a loopback-enabled remote device on a tested network.
  • The bit stream is looped back to the local device.
  • Upon receipt of the bit stream, the PRBS monitoring module on the local device checks whether the bit stream is the same as the one previously sent and determines whether the link or devices on the tested network are working properly.

PRBS testing includes user-side and network-side tests.

Figure 15-1 shows user-side RPBS testing.

Figure 15-1 User-side RPBS testing

After PRBS testing is enabled on PE1, PE1 sends a PRBS bit stream to the remote loopback-enabled CE. The PRBS bit stream is then looped back to PE1. Upon receipt of the bit stream, PE1 checks whether the bit stream is the same as the one previously sent and calculates a bit error rate.

Figure 15-2 shows network-side RPBS testing.

Figure 15-2 Network-side RPBS testing

After PRBS testing is enabled on PE1, PE1 sends a PRBS bit stream to PE2 that has local loopback enabled. The PRBS bit stream is then looped back to PE1. Upon receipt of the bit stream, PE1 checks whether the bit stream is the same as the one previously sent and calculates a bit error rate.

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Updated: 2019-01-02

Document ID: EDOC1100058399

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